Railway Board offers opulent and revered job posts to its aspirants. And it is not every year that we get the notification from Railway offering a good number of vacant seats to the multitude aspirants. But the current year 2018 brought a pleasant surprise with almost 1,27,278 seats to be filled by the valid candidates. Opportunity is here but you have to welcome it with a provident strategy.
Q1. What is the minimum distance (in metres) required to hear an echo?
एक गूंज सुनने के लिए आवश्यक न्यूनतम दूरी (मीटर में) क्या है?
(a) 10
(b) 13
(c) 17
(d) 21
Ans.(c)
Sol. Echo is a reflection of sound that arrives at the listener with a delay after the direct sound. The reflecting object must be more than 17m from the sound source for echo to be perceived by a person located at the source.
Sol. Echo is a reflection of sound that arrives at the listener with a delay after the direct sound. The reflecting object must be more than 17m from the sound source for echo to be perceived by a person located at the source.
Q2 Why does a Black board appears black in colour?
एक ब्लैक बोर्ड रंग में काला क्यों दिखता है?
(a) It reflects black colour /यह काले रंग को दर्शाता है.
(b) It absorbs black colour /यह काले रंग को अवशोषित करता है.
(c) It reflects all colour /यह सभी रंग को दर्शाता है.
(d) It absorbs all colour /यह सभी रंग को अवशोषित करता है.
Show Answer
Ans.(d)
Sol. A black board appears black because it absorbs all the colors of white light and reflects none.
Sol. A black board appears black because it absorbs all the colors of white light and reflects none.
Q3. Which of the following instrument is used to measure Soil Water Tension?
मृदा जल तनाव को मापने के लिए निम्नलिखित में से कौन सा उपकरण उपयोग किया जाता है?
(a) Photometer/ प्रकाशमिति
(b) Pyrometer/ उत्तापमापी
(c) Psychrometer/ साइक्रोमीटर
(d) Tensiometer/ टिन्सीऑमिटर
Show Answer
Ans.(d)
Sol. A tensiometer in soil science is a measuring instrument used to determine the Soil water tension. Such tensiometers are used in irrigation scheduling to help farmers and other irrigation managers to determine when to water. It can also be used in the scientific study of soils and plants.
Sol. A tensiometer in soil science is a measuring instrument used to determine the Soil water tension. Such tensiometers are used in irrigation scheduling to help farmers and other irrigation managers to determine when to water. It can also be used in the scientific study of soils and plants.
Q4. What is the SI unit of Force?
बल की SI इकाई क्या है?
(a) Pascal/पास्कल
(b) Boyle/बॉयल
(c) Newton/ न्यूटन
(d) Watt/वाट
Show Answer
Ans.(c)
Sol. The SI unit of Force is Newton. One Newton is equal to 1 kilogram meter per second squared.
Sol. The SI unit of Force is Newton. One Newton is equal to 1 kilogram meter per second squared.
Q5. Which one of the following is a bad Thermal Conductor?
निम्नलिखित में से कौन सा खराब थर्मल कंडक्टर है?
(a) Aluminium/ एल्युमीनियम
(b) Copper / कॉपर
(c) Glass/ ग्लास
(d) Silver/ सिल्वर
Show Answer
Ans.(c)
Sol. Glass is bad thermal conductor and is a good insulator. It has tightly held electrons which did not allow heat to flow through it.
Sol. Glass is bad thermal conductor and is a good insulator. It has tightly held electrons which did not allow heat to flow through it.
Q6. Who invented first working laser?
किसने पहला वर्किंग लेजर का आविष्कार किया?
(a) A. H. Taylor/ ए एच टेलर
(b) W. K. Roentgen/ डब्लू के रॉटजन
(c) T. H. Maiman/टी एच माईमान
(d) Fred Morrission/ फ्रेड मॉरिसन
Show Answer
Ans.(c)
Sol. LASER (LIGHT AMPLIFICATION BY STIMULATED EMMISSION OF RADIATION) is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The first laser was built in 1960 by Theodore H. Maiman.
Sol. LASER (LIGHT AMPLIFICATION BY STIMULATED EMMISSION OF RADIATION) is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The first laser was built in 1960 by Theodore H. Maiman.
Q7. Meter in a vehicle that calculates distance covered by the vehicle is called __________.
एक वाहन में मीटर जो वाहन द्वारा कवर दूरी की गणना करता है उसे __________ कहा जाता है
(a) Speedometer /स्पीडोमीटर
(b) Odometer/ओडोमीटर
(c) Thermometer /थर्मामीटर
(d) Kilometre/ किलोमीटर
एक वाहन में मीटर जो वाहन द्वारा कवर दूरी की गणना करता है उसे __________ कहा जाता है
(a) Speedometer /स्पीडोमीटर
(b) Odometer/ओडोमीटर
(c) Thermometer /थर्मामीटर
(d) Kilometre/ किलोमीटर
Show Answer
Ans.(b)
Sol. An odometer or odograph is an instrument for measuring the distance travelled by a vehicle, such as a bicycle or car. The device may be electronic, mechanical, or a combination of the two.
Sol. An odometer or odograph is an instrument for measuring the distance travelled by a vehicle, such as a bicycle or car. The device may be electronic, mechanical, or a combination of the two.
Q8. What is the SI unit of pressure?
दबाव की SI इकाई क्या है?
(a) Newton /न्यूटन
(b) Weber/वेबर
(c) Pascal /पास्कल
(d) Henry/हेनरी
दबाव की SI इकाई क्या है?
(a) Newton /न्यूटन
(b) Weber/वेबर
(c) Pascal /पास्कल
(d) Henry/हेनरी
Show Answer
Ans.(c)
Sol. The SI unit for pressure is the pascal (Pa), equal to one newton per square metre (N/m2). This name for the unit was added in 1971. It is named after the French polymath Blaise Pascal.
Sol. The SI unit for pressure is the pascal (Pa), equal to one newton per square metre (N/m2). This name for the unit was added in 1971. It is named after the French polymath Blaise Pascal.
Q9. Reflection from a smooth surface like that of a mirror is called ___________ reflection.
एक दर्पण की तरह एक चिकनी सतह से प्रतिबिंब ___________ प्रतिबिंब कहा जाता है।
(a) Regular / नियमित
(b) Irregular / अनियमित
(c) Diffused/ विसरित
(d) Fused/ संगलित
एक दर्पण की तरह एक चिकनी सतह से प्रतिबिंब ___________ प्रतिबिंब कहा जाता है।
(a) Regular / नियमित
(b) Irregular / अनियमित
(c) Diffused/ विसरित
(d) Fused/ संगलित
Show Answer
Ans.(a)
Sol. When a beam pass of parallel light rays is incident on a smooth and plane surface, the reflected rays will also be parallel. This type of reflection is called Regular Reflection.
Sol. When a beam pass of parallel light rays is incident on a smooth and plane surface, the reflected rays will also be parallel. This type of reflection is called Regular Reflection.
Q10. What is the unit of resistance?
प्रतिरोध की इकाई क्या है?
(a) Ohm/ ओम
(b) Farad/ फैरड
(c) Henry/ हेनरी
(d) Weber/ वेबर
Show Answer
Ans.(a)
Sol. The ohm (symbol: Ω) is the SI derived unit of electrical resistance, named after German physicist Georg Simon Ohm.
Sol. The ohm (symbol: Ω) is the SI derived unit of electrical resistance, named after German physicist Georg Simon Ohm.
Q11. Gravitational force is maximum at which of the following place?
निम्न में से किस स्थान पर गुरुत्वाकर्षण बल अधिकतम है?
(a) At equator (भूमध्य रेखा पर)
(b) At tropic of cancer (कर्क रेखा पर)
(c) At tropic of Capricorn (मकर रेखा पर)
(d) At poles (ध्रुवों पर)
निम्न में से किस स्थान पर गुरुत्वाकर्षण बल अधिकतम है?
(a) At equator (भूमध्य रेखा पर)
(b) At tropic of cancer (कर्क रेखा पर)
(c) At tropic of Capricorn (मकर रेखा पर)
(d) At poles (ध्रुवों पर)
Show Answer
Ans (d)
Sol. The value of Gravitational Force range from a minimum of 9.78 metre per second squared at the Equator to a maximum of 9.83 metre per second squared at the poles. Hence Gravitational Force is maximum on polls.
Sol. The value of Gravitational Force range from a minimum of 9.78 metre per second squared at the Equator to a maximum of 9.83 metre per second squared at the poles. Hence Gravitational Force is maximum on polls.
Q12. Which of the following device is used to measure humidity?
निम्न डिवाइस में से कौन सा नमी को मापने के लिए उपयोग किया जाता है?
(a) Hydrometer (हाइड्रोमीटर)
(b) Hygrometer (आर्द्रतामापी)
(c) Odometer (ओडोमीटर)
(d) Anemometer (एनीमोमीटर)
निम्न डिवाइस में से कौन सा नमी को मापने के लिए उपयोग किया जाता है?
(a) Hydrometer (हाइड्रोमीटर)
(b) Hygrometer (आर्द्रतामापी)
(c) Odometer (ओडोमीटर)
(d) Anemometer (एनीमोमीटर)
Show Answer
Ans.(b)
Sol. A hygrometer is an instrument used for measuring the water vapour (humidity) in the atmosphere.
Sol. A hygrometer is an instrument used for measuring the water vapour (humidity) in the atmosphere.
Q13. Which of the following is not a vector quantity?
इनमें से कौन सा एक वेक्टर मात्रा नहीं है?
(a) Momentum (संवेग)
(b) Displacement (विस्थापन)
(c) Torque (टार्क)
(d) Speed (गति )
Show Answer
Ans.(d)
Sol. Speed is the distance travelled by object in a certain interval of time. Speed is not dependent on direction hence it is a scalar quantity. While Displacement, Momentum and Torque has both magnitude and direction, so they are vector quantity.
Sol. Speed is the distance travelled by object in a certain interval of time. Speed is not dependent on direction hence it is a scalar quantity. While Displacement, Momentum and Torque has both magnitude and direction, so they are vector quantity.
Q14. At what temperature (in Fahrenheit) pure water freezes?
किस तापमान पर (फारेनहाइट में) शुद्ध पानी जम जाता है?
(a) 32
(b) 0
(c) 48
(d) 37
किस तापमान पर (फारेनहाइट में) शुद्ध पानी जम जाता है?
(a) 32
(b) 0
(c) 48
(d) 37
Show Answer
Ans.(a)
Sol. The temperature at which a liquid freezes is called the Freezing Point. The freezing point of water is 32°F.
Sol. The temperature at which a liquid freezes is called the Freezing Point. The freezing point of water is 32°F.
Q15. What is the other name of Galileo’s law of falling bodies?
गैलीलियो के गिरने वाले निकायों के कानून का दूसरा नाम क्या है?
(a) Law of motion/गति का कानून
(b) Newton’s first law/न्यूटन का पहला कानून
(c) Newton’s second law/ न्यूटन का दूसरा कानून
(d) Newton’s third law/ न्यूटन का तीसरा कानून
गैलीलियो के गिरने वाले निकायों के कानून का दूसरा नाम क्या है?
(a) Law of motion/गति का कानून
(b) Newton’s first law/न्यूटन का पहला कानून
(c) Newton’s second law/ न्यूटन का दूसरा कानून
(d) Newton’s third law/ न्यूटन का तीसरा कानून
Show Answer
Ans. (b)
Sol. Newton’s first law is other name of Galileo’s law of Falling bodies. According to Law of Fall “The distance travelled by falling body is directly proportional to the square of the time it takes to fall”. This latter claim states that a body in motion will continue its motion so long as no factor disturbs that motion. This principle is called the principle of inertia which is basis of Newton’s first law
Sol. Newton’s first law is other name of Galileo’s law of Falling bodies. According to Law of Fall “The distance travelled by falling body is directly proportional to the square of the time it takes to fall”. This latter claim states that a body in motion will continue its motion so long as no factor disturbs that motion. This principle is called the principle of inertia which is basis of Newton’s first law
